The China Mobile, Huawei, and ZTE BNG Simple Control and User Plane Separation Protocol (S-CUSP)
draft-chz-simple-cu-separation-bng-protocol-06

Document Type Active Internet-Draft (individual)
Last updated 2019-10-25 (latest revision 2019-10-19)
Stream ISE
Intended RFC status Informational
Formats plain text pdf htmlized bibtex
IETF conflict review conflict-review-chz-simple-cu-separation-bng-protocol
Stream ISE state In IESG Review
Consensus Boilerplate Unknown
Document shepherd Adrian Farrel
Shepherd write-up Show (last changed 2019-10-22)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to Adrian Farrel <rfc-ise@rfc-editor.org>
IANA IANA review state IANA OK - No Actions Needed
INTERNET-DRAFT                                                     S. Hu
Intended status: Informational                              China Mobile
                                                             D. Eastlake
                                                  Futurewei Technologies
                                                                  F. Qin
                                                            China Mobile
                                                                 T. Chua
                                            Singapore Telecommunications
                                                                D. Huang
                                                                     ZTE
Expires: April 18, 2020                                 October 19, 2019

                 The China Mobile, Huawei, and ZTE BNG
       Simple Control and User Plane Separation Protocol (S-CUSP)
             draft-chz-simple-cu-separation-bng-protocol-06

Abstract

   A Broadband Network Gateway (BNG) in a fixed wireline access network
   is an Ethernet-centric IP edge router and the aggregation point for
   subscriber traffic. Control Plane (CP) and User Plane (UP) Separation
   (CUPS) for such a BNG improves flexibility and scalability but
   requires various communication between the UP and the CP.  China
   Mobile, Huawei Technologies, and ZTE have developed a simple CUPS
   control channel Protocol (S-CUSP) to support such communication.

   This document is not an IETF standard and does not have IETF
   consensus.  S-CUSP is presented here to make its specification
   conveniently available to the Internet community to enable diagnosis
   and interoperability.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Distribution of this document is unlimited. Comments should be sent
   to the authors.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Hu, et al                                                       [Page 1]
INTERNET-DRAFT                                           Simple BNG CUSP

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/1id-abstracts.html. The list of Internet-Draft
   Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

Hu, et al                                                       [Page 2]
INTERNET-DRAFT                                           Simple BNG CUSP

Table of Contents

      1.  Introduction...........................................6
      2.  Terminology............................................7
        2.1.  Implementation Requirement Keywords................7
        2.2.  Terms..............................................7
      3.  BNG CUPS Overview.....................................10
        3.1.  BNG CUPS Motivation...............................10
        3.2.  BNG CUPS Architecture Overview....................10
        3.3.  BNG CUPS Interfaces...............................12
        3.3.1.  Service Interface...............................13
        3.3.2.  Control Interface...............................14
        3.3.3.  Management Interface............................14
        3.4.  BNG CUPS Procedure Overview.......................14
      4.  S-CUSP Protocol Overview..............................18
        4.1.  Control Channel Related Procedures................18
        4.1.1.  S-CUSP Session Establishment....................18
        4.1.2.  Keepalive Timer and DeadTimer...................19
        4.2.  Node Related Procedures...........................20
        4.2.1.  UP Resource Report..............................20
        4.2.2.  Update BAS Function on Access Interface.........21
        4.2.3.  Update Network Routing..........................21
        4.2.4.  CGN Public IP Address Allocation................22
        4.2.5.  Data Synchronization between the CP and UP......23
        4.3.  Subscriber Session Related Procedures.............24
        4.3.1.  Create Subscriber Session.......................25
        4.3.2.  Update Subscriber Session.......................26
        4.3.3.  Delete Subscriber Session.......................27
        4.3.4.  Subscriber Session Events Report................27
      5.  S-CUSP Call Flows.....................................29
        5.1.  IPoE..............................................29
        5.1.1.  DHCPv4 Access...................................29
Show full document text